It also introduced, and led to the broad adoption of, a few really nice features: truly effective spam filtering
Google Mail's spam filtering is many things, but I don't see why it's been particularly effective. Adaptive spam filtering was already being done before GMail came along, and unlike GMail's approach, the filters in other popular email clients didn't lurch so far towards avoiding false negatives that they all but broke normal email by having so many false positives.
Google Mail's spam filtering is many things, but I don't see why it's been particularly effective. Adaptive spam filtering was already being done before GMail came along, and unlike GMail's approach, the filters in other popular email clients didn't lurch so far towards avoiding false negatives that they all but broke normal email by having so many false positives.